Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on linus/master v5.15-rc4]
[cannot apply to hnaz-mm/master next-20211008]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/ultrachin-163-com/mm-Free-per-cpu-pages-async-to-shorten-program-exit-time/20211008-145835
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5816b3e6577eaa676ceb00a848f0fd65fe2adc29
config: i386-randconfig-a001-20211008 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project b1a45c62f03ecbeb4544b0c65a01ee4586235a61)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/3e55b36596eb3a798c6f649e5e1c0f5eac8522b3
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review ultrachin-163-com/mm-Free-per-cpu-pages-async-to-shorten-program-exit-time/20211008-145835
        git checkout 3e55b36596eb3a798c6f649e5e1c0f5eac8522b3
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> kernel/exit.c:170:26: error: no member named 'cpu' in 'struct task_struct'
           unsigned int cpu = tsk->cpu;
                              ~~~  ^
   kernel/exit.c:1812:13: warning: no previous prototype for function 'abort' [-Wmissing-prototypes]
   __weak void abort(void)
               ^
   kernel/exit.c:1812:8: note: declare 'static' if the function is not intended to be used outside of this translation unit
   __weak void abort(void)
          ^
          static 
   1 warning and 1 error generated.


vim +170 kernel/exit.c

   166	
   167	static void delayed_put_task_struct(struct rcu_head *rhp)
   168	{
   169		struct task_struct *tsk = container_of(rhp, struct task_struct, rcu);
 > 170		unsigned int cpu = tsk->cpu;
   171	
   172		perf_event_delayed_put(tsk);
   173		trace_sched_process_free(tsk);
   174		put_task_struct(tsk);
   175		kfreepcp_set_run(cpu);
   176	}
   177	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org